| Citation: | PENG Xian，OU Chenghua，XIAO Furun，et al. Three-dimensional characterization of natural gas heterogeneity controlled by gypsum-salt layer in the Feixianguan Formation in the Tieshanpo area[J]. Bulletin of Geological Science and Technology，2025，44（2）：1-11 doi: 10.19509/j.cnki.dzkq.tb20230558
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Natural gas heterogeneity controlled by gypsum-salt layers is a significant model for enrichment and accumulation. While previous studies have primarily focused on experimental testing and qualitative descriptions, they have lacked three-dimensional characterization of the gypsum-salt layers distribution. This study proposes a novel three-dimensional modeling technique that integrates well-seismic data with sedimentary microfacies control in both the gypsum-salt layer and the gas-water layer.
The proposed technique encompasses five key technical aspects: (1) logging interpretation and 3D modeling of the gypsum-salt layer controlled by sedimentary microfacies, (2) seismic genetic inversion-based 3D modeling of the gypsum-salt layer guided by sedimentary microfacies, (3) well-seismically integrated 3D modeling of the gypsum-salt layer, (4) 3D modeling of gas-water distribution influenced by sedimentary microfacies, and (5) fusion-based 3D modeling of both the gypsum-salt and gas-water layers.
This method was applied to assess the influence of the gypsum-salt layer within the Feixianguan Formation in the Tieshanpo gas field of the Sichuan Basin on gas accumulation characteristics. Accurate 3D geological models were constructed that integrate well-seismic data with sedimentary microfacies control for both the gypsum-salt and gas-water layers. The results indicated that, except for some localized areas, a continuous distribution was observed across most regions of the Feixianguan Formation in the Tieshanpo area. Additionally, the formation exhibited multilayered characteristics with significant longitudinal thickness heterogeneity. Three distinct models were developed to illustrate the effects of gas capping, reduced gas storage capacity, and complex reservoir conditions resulting from the heterogeneous influence of the gypsum-salt layer.
These findings provide essential geological insights that can inform the development of effective strategies targeting natural gas reserves at non-equilibrium scales.
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